Parabola: Hardware backlight varies in different desktops

LXQt shell: Hw backlight not working, using soft backlight
Deepin shell: Hw backlight working, soft backlight not needed
MATE shell: NOT hw OR soft backlight working
Liri shell: /home/$YOURNAME/.config/liri/platform.json unknown, shell always dying
Liri is a system itself, but it is also working as a repo in a current Arch derivative,
https:liri.io
WARNING: Liri (both OS and desktop) is in alpha stage which expects issues.
For the same LXQt and MATE in my Flidas system the hardware backlight in BOTH desktop shells is working.